Script variables should be supported in BDD test (in Test Complete)

Currently, while using script tests in Test complete, it does not support use of variable as a parameter in feature file. Currently it gives me error for definition i.e step not defined.

i.e. Instead of below step:
***************************************************************
When user logs into cartopia with "gen_uiAuto" and "R@n0rex853"
***************************************************************

I should be able to pass variable(uid, pwd) in feature file like in below step:
I have declared & assigned value to this variable in script file.
***************************************************
When user logs into cartopia with {uid} and {pwd}
***************************************************